books.google.com - "Differential and Integral Calculus, Volume 2" "Unlike modern mathematicians who pursue their research apart from engineering or physical applications, Richard Courant was adverse to abstract theories and vague theorems. The topics covered in this set will provide the reader with a solid background to...http://books.google.com/books/about/Differential_and_Integral_Calculus.html?id=F0AhmkhyBYUC&q=improper+integral&utm_source=gb-gplus-shareDifferential and Integral Calculus